Wednesday, June 25, 2008

Equalizer (EQ) is a signal processor that used to equalized or balanced any signal frequency level. There are three common types of EQ, shelving, sweep and parametric.

Shelving EQ is only has one parameter that used to control loudness (dB) of the frequency. For example, 3 band shelving EQ which only has 3 knobs (Bass, Mid, Treble), we could only change those 3 fixed frequencies. 15 and 13 band frequencies are ussualy called 1/3 or 2/3 octave graphic equalizer.

Sweep EQ has two parameters, which are parameter to control loudness (dB) and parameter to choose frequency (Hz). This type of EQ is ussualy found on professional mixer. Find the frequency that want to be changed and then increase (boost) or decrease (cut) the frequency loudness.

Parametric EQ has three parameters, which are loudness (dB), frequency (Hz) and bandwidth (octave) parameters. This type of EQ can be used as shelving and sweep eq. We can do alot of things when using this EQ such as removing hum, hiss or any unwanted sound without changing the overall sound. We could also adding more byte/edge or brightness to the sound by using this EQ.